Arduino Music Technology
Codec Shield by Open Music Labs

The Audio Codec Shield by Open Music Labs is a way to add powerful digital signal processing capabilities to your next project. It is capable of sampling and reproducing up to 88kHz audio in 24-bit stereo. You can use it as a piece of test equipment, recording device, or even a custom real-time instrument effects processor. Libraries are available for both Arduino and Maple to help get you started. Happy audio hacking!